Floating

and

Sinking

 

 

Everyday Experiences

1.1 Design a Model Oil Rig:

Task: Only your imagination and creativity limits this activity.

A) Build an oil rig like Kevin's found in the book on page 81 You can substitute materials to improve the design with the following limits:

[1] Keep it small enough to float in a pail or dish pan

[2] You must be able to adjust the level of floating

[3] It must carry 1/3 of a pop can of water on the deck. (approx. 100g)

Materials useful in improving Kevins model

Plastic peanut butter jars, straws, coffee cups,plywood, foam insulation rubber tubing, bicycle inner tubes, balloons, glue, pop bottles. . . .

Oil Rig Evaluation

Evaluated Item

Peer Evaluation

(please circle one)

Teacher Mark

Dramatic value

1 3 5 7 8 9 10

 

Range of submersion

2 4 6 8 9 10

 

Originality of design

1 3 5 7 8 9 10

 

Ease of operation

1 3 5 7 8 9 10

 

Stability

0 1 3 5 7 8 9 10

 

Overall design superiority

1 3 5 7 8 9 10

 

Total Mark

 

B) Word usage, vocabulary development

Underline vocabulary words in the paragraph as shown below:

semi-submersible

ballast

buoyant

The Ocean Ranger was a large semi-submersible oil drilling platform. It was used to drill for oil in the North Atlantic Ocean. Everyone thought it was very buoyant and an excellent floater. Changing sea water ballast could adjust the level floating. It did not rest on the sea bottom. This is why it was considered semi-submersible.

One day---it is believed a large wave crashed on the platform. This caused too much ballast to be allowed in the rig. The Ocean Ranger was not buoyant enough to hold all that water ballast. It sank and seventy lives were lost. The semi-submersible sank under the weight of too much ballast.

 

Fill in the blanks using the following vocabulary word key:

e

semi-submersible

t

ballast

c

buoyant

 

A Better e_____________________

Kevin designed a e______________________ found in your book on page 82. It is difficult to get the t________________ out of Kevin's model. The is a design problem. Kevin's semi-submersible is most c________________ when it has no water t________________ in the pop cans. When water t________________ is added to the cans the semi-submersible becomes less c________________ and sinks lower in the water.

You can improve the design of the e____________________ . You can make a model which can change the t________________ with ease. The rig is most stable when you add t________________ to make it float lower in the water. The semi-submersible is most c_______________when it has less t____________. To make a well designed e_______________________ you must solve this problem.

1.2 Submarine Divers

Version-1

.21 Set up the diver apparatus as shown in the diagram

.22 Squeeze the bottle and then release it

.23 Play with the bottle until you are sure you know what makes it work.

.24 Complete the diagram below to record the important things you see.

Either place the dropper in the most likely floating place in in the bottle or Place the corresponding letter of the eyedropper in the blank beside the level which it is most likely to float.

 

1.2 Submarine Divers

Version-2

.21 Set up the diver apparatus as shown in the diagram

.22 Squeeze the bottle and then release it

.23 Play with the bottle until you are sure you know what makes it work.

 

 

More Advanced:

.24 Remove the cap and place a second dropper inside so that one floats and the other sinks when the diver is operated

(make sure the cap is tight)

.25 What would happen if you replace the droppers with small glass test tubes? Can you make it work? Try it.

.26 Use the vocabulary (ballast, buoyant, sink, float) to explain in your own words how what you have learned can be applied to making a better model oil rig. If you find this too difficult see ('*' below)

.* Use the secret code in the table below to confirm how the diver works.

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

S

T

U

V

W

X

       

Y

Z

       

 

     

     

 

                           
         

         

 

                           
 

 

 

                           

 

 

                           

 

 

 

                             

 

     

 

                           

 

 

 

                           

 

   

 

 

             

.

           

 

 

 

 

                           

     

 

 

           

.

                 

 

 

 

                             

 

 

 

                           

.

 

 

 

                           

 

   

 

 

                           

 

 

 

                               

 

 

 

                             

.

 

 

 

                               

 

 

 

                           

 

 

     

 

 

     

     

 

   

S

U

B

M

A

R

I

N

E

     
         

         

 

       

D

I

V

E

R

         
 

 

 

S

E

C

R

E

T

 

D

E

C

O

D

E

D

 

                           

 

 

B

Y

 

S

Q

U

E

E

Z

I

N

G

 

T

H

E

 

     

B

O

T

T

L

E.

 

W

A

T

E

R

     

 

 

B

A

L

L

A

S

T

 

E

N

T

E

R

S

 

 

   

 

T

H

E

 

D

I

V

E

R.

   

A

I

R

 

 

 

 

I

N

 

T

H

E

 

D

I

V

E

R

 

I

S

     

 

S

Q

U

E

E

Z

E

D.

     

T

H

E

     

 

 

D

I

V

E

R

 

S

I

N

K

S

 

F

R

O

M

 

 

T

H

E

 

E

X

T

R

A

 

W

E

I

G

H

T.

 

 

R

E

L

E

A

S

I

N

G

 

Y

O

U

R

 

 

   

 

G

R

I

P

 

L

E

T

S

   

T

H

E

 

 

 

S

Q

U

E

E

Z

E

D

 

A

I

R

 

P

U

S

H

 

 

W

A

T

E

R

 

B

A

L

L

A

S

T

 

O

U

T.

 

 

T

H

E

 

B

U

O

Y

A

N

T

 

F

O

R

C

E

 

 

O

F

 

W

A

T

E

R

 

P

U

S

H

E

S

 

 

     

T

H

E

 

D

I

V

E

R

 

U

P

     

 

1.3 Redesign Model (A) Josh's Model

Josh Bearden a grade nine student, made the following model oil rig .It is very simple yet effective. It is very stable,and easy to adjust the ballast.

Can you pilot this semi-submersible? Try.

When you think you know how to raise and lower the semi-submersible rig decipher the cryptogram on the next page to confirm your idea

 

Key:

a b c d e f g h i j k l m

a b c d e f g h i j k l m

n o pq r s t u v w x y z

n o p q r s t u v w x y z

 

Piloting Josh's semi-submersible Rig

 

Adjust the plywood stabilizer to the desired

floating level. Loosen the cover to allow ballast to

enter. The rig becomes less buoyant and sinks.

Tighten the cover or the jar. lower the plywood stabilizer. blow

into the straw to force the ballast out and make the

semi-submersible more buoyant. The buoyant

force of the water pushes the

semi-submersible rig up.

Piloting Josh's Semi-submersible Rig

 

Adjust the plywood stabilizer to the desired

floating level. Loosen the cover to allow ballast to

enter. The rig becomes less buoyant and sinks.

Tighten the cover or the jar. lower the plywood stabilizer. Blow

into the straw to force the ballast out and make the

semi-submersible more buoyant. The buoyant

force of the water pushes the

semi-submersible rig up.

(B) Improving a Design

You have now learned a simple neat way of changing the ballast If you wish to redesign the rig to make it better you are encouraged to do so.

(Re-evaluation sheet )

Evaluated Item

Peer Evaluation

(please circle one)

TeacherMark

Dramatic value

1 3 5 7 8 9 10

 

Range of submersion

1 4 6 8 9 10

 

Originality of design

1 3 5 7 8 9 10

 

Ease of operation

1 3 5 7 8 9 10

 

Stability

0 1 3 5 7 8 9 10

 

Overall design superiority

1 3 5 7 8 9 10

 

Total Mark

 

 

1.4a- Where's the Ballast? (Modified Version)

 

 

Experiment and fill in the table:

 

 

 

1.4b- Where's the Ballast? (Advanced version)

 

 

Investigate the question, "How does the number of dives affect the recovery time of the diver?"

Hypothesis: ____________________________________________________________________________________________________________________________________

Manipulated Variable:

____________________________________________________________________________________________________________________________________

Responding Variable:

____________________________________________________________________________________________________________________________________

Data Collection:

Data Table: (Make your own)

Graph: (Graph the variables from your data. Be sure to title your graph. )

Conclusions:

____________________________________________________________________________________________________________________________________

____________________________________________________________________________________________________________________________________

__________________________________________________________________

Propose further questions for investigation which might identify significant variables? (Ask, "What would happen if … ?")

__________________________________________________________________

__________________________________________________________________

1.5 Famous Sinkers and floaters

Simplified article on the Titanic

(Incomplete, not included)

1.6 Concentration Match Card Game

1.62 (Author notes:Trip Game "Don't Rock The Ship...".Takes on ballast and laminated velcro attachments ship features ballast, larger ship, air bags, and life jacket, abandon ship, lifeboats.